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VISIBLE LIGHT ENCRYPTION METHOD, DECRYPTION METHOD, COMMUNICATION DEVICE AND COMMUNICATION SYSTEM

  • US 20150146871A1
  • Filed: 01/29/2015
  • Published: 05/28/2015
  • Est. Priority Date: 07/31/2012
  • Status: Active Grant
First Claim
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1. A visible light signal decryption method, comprising:

  • receiving a visible light signal from a transmit end, wherein the visible light signal is encrypted at the transmit end by using a key;

    obtaining the key, and decrypting the visible light signal according to the key, wherein the obtaining the key comprises;

    obtaining a key corresponding to a state of a state machine of a receive end;

    or, obtaining indication information according to the visible light signal and obtaining the key according to the indication information, wherein the indication information is used to obtain the key;

    wherein the obtaining indication information according to the visible light signal and obtaining the key according to the indication information, wherein the indication information is used to obtain the key comprises;

    converting the received visible light signal into a digital signal;

    decomposing the digital signal into a signal that comprises a pseudocode sequence indicator and a pseudocode signal;

    querying a pseudocode sequence corresponding to the pseudocode sequence indicator, wherein the pseudocode sequence is the key;

    decrypting the pseudocode signal according to the pseudocode sequence;

    wherein the decomposing the digital signal into a signal that comprises a pseudocode sequence indicator and a pseudocode signal, and querying a pseudocode sequence corresponding to the pseudocode sequence indicator, comprise;

    decomposing the digital signal into a device addressing code and a first integrated signal;

    decomposing the first integrated signal into the pseudocode sequence indicator and the pseudocode signal; and

    determining legality of the pseudocode sequence indicator according to a device addressing code, and if the pseudocode sequence indicator is legal, querying the pseudocode sequence corresponding to the pseudocode sequence indicator.

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